511551158978 has 4 divisors (see below), whose sum is σ = 767326738470. Its totient is φ = 255775579488.

The previous prime is 511551158977. The next prime is 511551159001. The reversal of 511551158978 is 879851155115.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 306580367809 + 204970791169 = 553697^2 + 452737^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (511551158977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127887789743 + ... + 127887789746.

Almost surely, 2^511551158978 is an apocalyptic number.

511551158978 is a deficient number, since it is larger than the sum of its proper divisors (255775579492).

511551158978 is a wasteful number, since it uses less digits than its factorization.

511551158978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255775579491.

The product of its digits is 2520000, while the sum is 56.

The spelling of 511551158978 in words is "five hundred eleven billion, five hundred fifty-one million, one hundred fifty-eight thousand, nine hundred seventy-eight".